Adjustable scaffold.



PATE-'NTBD'MAY z8, 1907Y W. J. MURRAY. ADJUSTABLE SGAFPGLD. APFLICATION FILED NOV. 12, 1906.

zsHEETssHBET 1.

y wzl/messes 4 TTHAVEP A0."a54,959. PATENTED MAY'za, 1907. WJJ; MURRAY. ADJUSTABLE SGAPFOLD.

APPLICATION FILED NOV. l2, 1906.

' 2 SHEETS-SHEET 2.

/NVEN Ton fzo`performe to rovide a scaffold of this description in Unir WILLLAM J, RAY,

or NEW YORK, N. Y.

v acuer-aas aparecen.

Specification of Lettere Patent. -Application filed November-12, 1908. Serial No. 842.978.

' Patented my 28,1997.

To aM whom it may concert/t:A I l v.15 building or the repair thereof; a further object being to provide such a scaffold which may be readilymoved from one position to another by the workmen thereon Without interferinv materially with the work being and a still further object being which diferent supports are .employedy and in -which the shifting from one set of su ports to another set may be accomplished without :z interfering, in any degree,V with the workmen thereon or their work.

My invention is lfully described in the following specification, of which the accompa- :nying drawings form a part, in which the sep- 3o arate parts are designated by suitable reference .characters in each of the views, and in Which:-

Figure 1 is a lon 'tudinal view of a scaffold constructed according to my invention and .35 shown artly in a section' taken on the linev 1`1 o Fig. 2;. and Fig. 2 is a view thereof v taken on the line 2-2 of Fig. 1 and showing partially thebuilding upon which it is mounted andthe manner o mounting.

4o In the drawings forming a part of this ap a' of structural iron and in course of construction and which comprises the usual uprights a, and horizontal beams a3 and in the prackticeof my invention I provide 'out-riggersb and b2 which are secured to the structuredin any desired manner but which may be readily removed from one position to another as thework progresses and it will be understood 5o that in buildings already finished the out riggers b and b2 may be pro'ected through Windows or secured to the roo 1n any manner to make them safe.' I

In the position of the scaffold shown the outgers b have each two rods suspended therleom said rods c being each secured, pretplication vI have shown' partially a building' preferably of angle-iron, said frames e arranged in pairs and each pair being secure toa horizontal beam e, said beams e serving as supports for the usual lanking f compos- 4ing the flooring of the sca old.

erably detachably, to? av framed coni osed.l l

Rotatably mounted in each of the frames'dv is a drum h rovided with-a gear-wheel It*B and a ratchet-w eel ha and a rope or cable h is wound upon the drums h and varev each provided With a hook h or e u ivalent device-on' otatably mounted 1n each of the frames d, over the drums h, is a the outer ends thereof;

shaft m provided with a crankeam v'm2 and with a pinion m3 engaging the gear-wheel 71,34 and Iloosely mounted on the shaft mis a pawl o which engages the teeth of the ratchetwheel h3 as clearly shown. Passing through the frames d, over theshafts 1n, is a rod p which is normally forced in the direction of jthe crank-arm m2 by means of a spring p2 and ,the rods p are each provided with a'handleI s 4 by means of which the may be drawn bac 'Wardly and, if desire dev ices to holdthe rods in their backwardposiition'may be provide simple devices for this/ purpose are known. l

In the use of my invention, a set of Aoutriggers bis placed in" osition and the hooksh of the cables h* are ung thereon and when none however being shown as various the crank-arms m2 are operated-the cables are wound -onthe corres onding drums until the frames d"areclear o the ground after which the lanking f is placed in position and the sca `old is ready tor use, and, as the Work progresses, the scaffold' is raised by degrees l until theeables are almost entirely Woundbn the drums and the scaifold is in close` proxf' imity to thel outriggers t. Before this osition has been reached by the scaffold," 'o W- ever, workmen other than those fup'on the scaffold have .arranged t eset bzl'of the outrig ers at aeater heigjt after which the.

ro s c are ho'o ed to the out-riggers b, .the cables unwoun'd from the drums and-the hooks thereof hung from ,the out-riggers 'b' 'and when the crank-armsare again operated the scaffold is 'spiprted' from theA out-riggers b after which the out-riggers'b are removed andsecured at a still greater height than the out4 'riggers b2' and ready for another shift. -It will be seen that the work being done from 1 the scaifcd has not been interfered withn' this shifting of supports and much savingof time results forl t e high' priced mechanics lfor the reason that ordinary laborers cah perform the Said :sbifting and they may also mine tbe scaffold by degreesby means of tlieI Malik-arms m2, and it will be understood tba* tbe Spring; operated rods/1 are used as an additional preventive means ol' iii-minding ol' llie eablos ill llie pawl o slionld l'ail lo engage tho r.noliet-wl|eel properly.

lla-ving l'nll)` described my invention, wlnil claim new, will tbe reservation ol` sneli inodilieations as nome within llie swipe ol' the, following claims, is:

The Combination n'illi two .bars lia-ving,r menos for detaeliablr seenrinf; tliezn to a building, ol: a pliillffrm, l'rames'on said plaitlorm carrying means operable lroin ille platl form and having connections adapted to be coinneted to one ol' Amid bars for raisingr the platl'orm, and mpporting moana on said frames extending above the said bar when tbe platform has been l'nllv raised and adapt,-

ed to detacbably engage said bar and rigidly pport tbe plaflorin therefrom, nliereln',

the platform may be ronneeled to one bar by the raising meansy and raised lo a level lo enf gage Llie supporting' mean will] Said bar and z5 may iben remain isupported by aid bar while tbe other bar is placed at a liiglier level and llie raisingr means secured to the latter7 the ara` tlnis beeomiin; alternately points oll raising support and nl' rigid lQnpporl l'or tbe plat- 3o lin-ins.

In testimony llt-1t l elaim llie. foregoing as my invention l llave Iii-flied my name in presence oll tbe snlisrrllnnV 'witnesses lln Si li da)y ol' November, 1906.

\\'llil,l.\,\l J. MURRAY. 'itnesses:

J. C. lnnisnx, Il. MOHLAN. 

